Automobile wiring harness overlap in vehicle control structure

The car wiring harness has a lot of wires, and the wires are in different colors for easy identification and repair. In order to facilitate the labeling in the circuit diagram, the wire cross-sectional area of the car harness is also marked in front of the color code.

The calculation of the connected common terminals is handled in the same way as in the special case of the harness inline process. The algorithm not only can complete the calculation of ordinary inline, but also the inline relationship consisting of multiple common inline (or single line), the online relationship with shielded lines and the inline relationship inside an electrical device ( It appears as a point in the model) and can be used directly to draw 昀 data.

The car wiring harness is the main body of the car circuit, and there is no car circuit without the wire harness. As people's safety, comfort, economy, and emissions requirements increase, automotive wiring harnesses become more complex. At present, the form of the wire harness is basically the same whether it is a high-end luxury car or an economical ordinary car, and it is composed of wires, connectors and wrapping tape.

With the continuous improvement of the degree of automation of automobiles, various controllers, sensors, wireless devices, display instrumentation devices and other electrical devices have also increased. In order to ensure the good working condition of these devices, special grounding treatment must be carried out according to their actual needs . Common engine combination meters and airbags should be connected by separate ground wires.

The common inline relationship expresses the vehicle harness process design information in the wire harness diagram, including topology information, geometric information, and physical information of each wire. The geometric information expresses the positional relationship of each segment in the actual wire harness assembly.

The wire harness is assembled on the car and generally does not affect the structural size of the car. Therefore, only the length of the wire harness and other materials used for the wire harness are required, and the wire length dimension tolerance is specified. The United States stipulates the nominal dimensional tolerances of the wires for cars, trucks, tractors, trailers and passenger cars to accurately calculate the length of each wire and reduce the accumulation error. Complex wire harnesses are generally referenced to the most installed locations, ensuring that each wire can be adapted to the connection and that each wire is not stretched.

Whether using ultrasonic welding or U-shaped terminal cold-punching joints, depending on the design requirements of the wiring harness product drawings, the contact insulation methods are also various. Generally, double-wall heat-shrinkable tubes, PVC tapes, special wear-resistant insulating tapes, etc. are used. Analyze the product design and post-process design of the car's ground wire, and give examples to illustrate the analogy analysis of the internal connection point design of the wire harness and the lead-out point of the grounding point, reflecting the different design schemes for product quality. Different effects of cost.

The system structure of the vehicle controller is divided into: signal conditioning function structure, control algorithm function definition, peripheral actuator control method and fault diagnosis definition. The design of the vehicle controller is based on the CAN network bus structure, and also relates to the CAN network structure and application layer. Protocol definition. Each part outputs the corresponding function definition document.

In order to ensure the quality and reliability of the wire harness, the development of the automotive wire harness detection system has a particularly important significance. At present, the wire harness detection system independently developed by the domestic automobile field is still basically blank. Based on the analysis of the actual situation of the wire harness detection problem, a wire harness detection theory and method are proposed, and a computer harness detection system is designed by combining the microcomputer and the single chip microcomputer.